Not that anyone will notice but I had to remove all the old comments (after dumping the database to preserve them). They had become linked to different posts than the ones they had been associated with and no longer made any sense. I suspect I broke all that when I cleared out a raft of automagically-saved drafts and revisions and then — stupidly — renumbered the remaining posts. Hmm, those post numbers must be important…
Goes to show how much attention I have been paying to this almost 10 year old wossname.